Synthesis of Ternary Complex-Based Ion Imprinted Polymer Sorbent for Selective Adsorption of Lead Ions

In this study, Lead(II) ion imprinted polymer particles were synthesized by preparing ternary complex of lead imprinted ion with ۴-(۲-pyridilazo) resorcinol (PAR) and ۴-vinylpyridine (VP) and then copolimerizing with methacrylic acid as functional monomer, Trimethylolpropane trimethacrylate (TRIM) as crosslinking agent, methanol as porogen, and benzoyl peroxide (BPO) as initiator. Polimerization was carried out by thermal method. HNO۳ ۵ M was used to remove the template ion by shaking the polymer for ۲۴ hours in several times to obtain leached IIP particles (Pb-IIPs). Non-Imprinted Polymers (NIPs) as control were similarly prepared without imprinted ion. In this study, two types of NIPs were made including with and without the addition of PAR ligands (NIP and NIPP). All polymer particles were characterized by spectral (FTIR), thermal (TGA-DTG), morphology (SEM), and nitrogen adsorption studies (BET). The adsorption and selectivity studies for lead ion were carried out with Pb-IIP, NIPP, and NIP. The adsorption of ۲۰ mg.L-۱ of lead(II) using ۲۵ mg of polymer particles in the pH ۶ with interaction time ۹۰ min. Maximum adsorption capacity of leached Pb-IIP was found to be ۱۴.۳ mg.g-۱. The Pb-IIPs displayed excellent selectivity againts three common divalent ions Cu(II), Cd(II), and Zn(II) with selectivity coefficient for each metal ions are ۱۹.۹۸, ۴۲.۱۵, and ۴۲.۹۶, respectively, showing high anti-interfere ability. The precision for the method (% RSD) to be ۲,۹ % for five times the replication of the adsorption measurement. A high percentage of recovery values ranging from ۹۷-۱۰۳ %, indicating its accuracy.

Keywords:

Lead , Ion imprinted polymer , Heavy metal , Selective adsorption , Separation